<html>

<head>
  <meta charset="utf-8">
  <!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
  <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css">
</head>

<body>
  
  <div class="container">
      <h1></h1>
    
    <form action="./imgUpdown" method="POST" name="updownImg" role="form" enctype="multipart/form-data">
      <legend>七牛图片上传测试</legend>
  
      <div class="form-group">
        <label for="">label</label>
        <input type="file" class="form-control" name="img" id="img">
      </div>
  
      <button type="submit" class="btn btn-primary">上传图片</button>
    </form>
  </div>
  


</body>

</html>